(19)

(11)

EP 0 781 481 A1

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(43) Date of publication: 02.07.1997 Bulletin 1997/27 (21) Application number: 95933114.0 (22) Date of filing: 12.09.1995

(51) International Patent Classification (IPC):  H04L 27/ 01( . ) H04L 25/ 03( . ) H03M 13/ 23( . ) H04L 27/ 22( . ) (86) International application number: PCT/US1995/011708 (87) International publication number: WO 1996/008903 (21.03.1996 Gazette 1996/13)

(84) Designated Contracting States: DE FR GB SE (30) Priority: 14.09.1994 US 19940305727 (71) Applicant: ERICSSON INC. Research Triangle Park, NC 27709 (US)	(72) Inventor: DENT, Paul, W. S-240 36 Stehags (SE) (74) Representative: Norin, Klas, et al  Telefonaktiebolaget L M Ericsson Patent and Trademark Department 126 25 Stockholm 126 25 Stockholm (SE)